DC voltage converter suppressor - has active suppressor filter fitted between supply connections and input connections of converter and incorporates linear regulator transistor

摘要

The suppressor filter (2) comprises a p-channel power MOSFET linear regulator transistor (13), a current source (15) connected with a gate electrode (14) of the transistor, a one-way rectifier and a regulating amplifier (16), which in common with the linear regulator transistor, the current source and a voltage distributor forms a closed control loop. The linear regulator transistor is connected between one of the supply connections (3) and one of the input connections (4). A further voltage distributor is provided which comprises three resistances (27-29), the middle connections of which are connected via an input of an operation amplifier (34) connected as one-way rectifier with an input of the regulating amplifier controlling the current source. ADVANTAGE - Improved interference suppression, partic. in 10 Hz to 10 KHz frequency range.